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Segment Information, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summarized Financial Information [Abstract]
Depreciation and amortization	$ 71,564	$ 72,397	$ 71,365
Capital expenditures	60,156	50,221	56,622
Reportable Geographic Region [Member] | Mainland China [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	15,122	16,775	18,503
Capital expenditures	4,539	13,656	21,998
Reportable Geographic Region [Member] | South Korea [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	6,499	6,787	5,882
Capital expenditures	469	556	9,983
Reportable Geographic Region [Member] | Americas [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,608	2,617	2,545
Capital expenditures	744	1,095	400
Reportable Geographic Region [Member] | South Asia/Pacific [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	2,372	2,388	2,022
Capital expenditures	1,809	2,282	2,959
Reportable Geographic Region [Member] | Japan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	3,554	3,782	3,434
Capital expenditures	994	1,288	1,903
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,395	2,507	2,132
Capital expenditures	1,350	634	1,345
Reportable Geographic Region [Member] | EMEA [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	985	1,387	1,498
Capital expenditures	1,168	1,224	1,430
Corporate and Other [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	40,029	36,154	35,349
Capital expenditures	$ 49,083	$ 29,486	$ 16,604

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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